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You are probably correct. I was basing the value off the input impedance specified in the data sheet. Measuring it on the pcb is tricky since the cap is encased in resin and I don't want to mess

C4 is probably 200pF, not 0.2.

Just got done measuring the blank resistors. They form a simple 2x100Mohm voltage divider with 10Gohm feeding the divided voltage to the rest of the circuit. Here is the updated schematic with all

Capsule is the MK221. Removing the tantalum cap seems to have restored the correct biasing conditions (65VDC offset at the output) so I will be ordering a replacement (and maybe everything to make

That is worth a shot for sure. RF and EMI are deceptive. Your headphones wires can easily act as antennas. Having one single ground point for everything helps. People normally think of ground loops

Hmm... I had a couple thoughts in the middle of the night. (1) I'm wondering if my output could be causing the issue. The wires to my headphone driver speakers are currently just two wires without any

Disconnect the tantalum cap and check voltages. You could then check it for leakage. If it's not the culprit, I would think it could be a micro crack in the PCB.

MV 203 is the preamplifier. What kind of capsule is it??Maybe you can get information from Microtech Gefell or Josephson (US Distributor)?

When you say; “It has a low-pass filtering at 33KHz, and so that includes some 47nF caps to GND already.” I’m looking at the schematic as well, where do those 47nF caps tie to ground? Is there a

Hey Jerry, Thanks for the suggestions. I have not yet tried either a cap to GND or a ferrite bead. I'm assuming the cap from signal to GND would be best placed as close as possible to the input pin on

Hi Pete, Yes, as a group member you can put files into a folder of your own and then link to it. Thanks, -Scott -- ---- Scott Helmke ---- scott@... ---- (734) 604-9340 ---- "I have ceased

Hey Scott, Thanks! Sorry for the large attachment WAV file. Won't do that again. Do you mean the files tab on the left? Should I use this first to upload, and then link to the file in the comment?

Have you tried adding a capacitor between input and ground? I would try with anything between 1nF and 4.7nF. You may also want to add a ferrite bead in series.

Here's a slightly better quality attachment of my mic wiring diagram. (sorry for the pixelation).

Hi Jerry, Thanks for responding! The mics signals are connected to the inverting inputs of the PGAs on each channel on the CODEC. Non-inverting inputs of PGAs are set to connect internally to VMID.

Hi Pete, Welcome to the group!? Looks like a very cool project. If I could make one suggestion with respect to using this group, it would be to take care not to send huge attachments out to the

sounds like maybe cell phone close by? Ferrite beads.? Ferrite Clamshell EMI Filter?

You don't say how they are connected to the CODEC. How are they powered, is there an active circuit?

Hi There folks! I've been experiencing some RF interference on some PUI AOM 5035L mics into a WM8960 CODEC. Any advice on how to mitigate this would be much appreciated! Sorry for the long message,

Hello, A while back I purchased a used MTG MV203 measurement mic to use as comparison/testing for any of my future projects. After researching the MTG documentation I built a rack-mounted power